Propeller



A. DANIELSONA PROPELLER. APPLICATION FILED JUNE 1, 192i.

Patented Aug-'8, 1922.

INVENTOR Z'zwflma' ATTORNEY mon axis,

narrate I STATES reareiw oieeice.

ALBIN DANIELSON, BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO HILMERJOHNSON. OF BROOKLYN, NEW YORK.

PROPELLER.

Application filed June 1, 1921.

T 0 all whom it may concern:

Be it known that T, ALBIN DANIELSON, a citizen of the United States ofAmerica, residing at Brooklyn, county of Kings, State of New York, haveinvented certain new and useful Improvements in Propellers, of which thefollowing is a specification.

This invention relates to propellers for aeroplanes and the like. andthe principal object is to provide a device of this nature wherein theangle of the blades may be changed at the will of the operator.

Another object is to providemeans whereby the blades may be moved to andheld in a neutral position in which the blades will merely featherthrough the air in rotation, so that very little resistance is offeredin starting whereby a light form of selfstarter may be installed for theengine.

Another object is to provide means whereby the blades may be rotatedabout a comsubstantially parallel with their respective longitudinalaxes so as to bring the effective posterior surfaces of the blades intomore or less direct thrust withthe air operated on so as to control therate of flight.

Another object is to provide means for rotating the blades about saidcommon axis in the reverse direction so as to render the anteriorsurfaces'of the blades effective. thus acting as a brake and reversingthe effect of the propeller without reversing the direction of drive.

Another object is to provide common controlling means for effecting allof these movements of the blades. I

With these and other objects in view, which will be more apparent as thespecification proceeds, the invention resides in certain novelconstruction and combination and relation of parts, the essentialfeatures of which are hereinafter fully described, are particularlypointed out in the appended claims, and are illustrated in theaccompanying drawing, in which Figure 1 is aside elevation of "myimproved propeller and attached mechanism. Figure 2 is a front View ofthe same.

Figure 3'is a transverse section taken substantially in line 3-3 ofFigure 1.

Figure 4 is a sectional view taken sub- I stantially in line l-4 ofFigure 3.

Like characters of reference refer to like parts in all views.

Referring to the accompanying drawing Specification of Letters Patent.

strengthening Patented Aug 8, 1922,

Serial No. 474,137.

in detail, 10 represents the propeller shaft which is in the form of ahollow tube and which may be rotated by any suitable train of mechanismfrom the motor or engine. Fixedly secured to or formed integrally withthe propeller shaft 10 is a pair of diametrically arranged trunnions 11.

A rod 12 is mounted for sliding movement in shaft 10 and is providedwith a pair of collars 13 and 14 fixedly secured to rod 12 and betweenthese collars is confined a sleeve 15. Suitable bearings are provided at16 between members 13 and ll and the member 15. The sleeve 15 isprovided with diametrically oppositely disposed ears 17 which protrudethrough slots 18 in the propeller shaft 10. The slots 18 extend to theforward end of the shaft where a cap 19 threadedly engages the end ofshaft 10, said cap being provided with a wrench socket 20.

The propeller blades are shown at 21 and are formed at their inner endswith cylindrical portions 22 seated-in hafts or tubes 23, The blades areproperly stream lined as required. and near the hafts each has a conicalprotuberance 2% formed on it. The hafts 23 are disposed on oppositesides of the drive shafts 10 with their axes parallel with the axis ofthe trunnions 11 and at right angles to the axis of the drive shaft 10.Hafts 23 are pivotally mounted on trunnions 11 by means of cars 25formed integrally with or secured rigidly to the hafts 23. Links 26connect cars 27 of the hafts 23 with respective ones of the ears 1?.

It,will now be seenthat by moving the rod 12 forwardly, sleeve 15 willbe moved forwardly and will draw with it links 26 which will cause theblades to move forward about the trunnions 11, whereby the posteriorportions of the blades will be moved to meet the air at a greater angleor pitch whereby effecting driving of the aeroplane.

The blades are shown ,in' Figure 1 as in the neutral position in whichcondition they merely cut the air in revolving and do not effect anymovement of the plane. This is the position of the blades in starting sothat required.

It will also be seen that the slots 18 extend rearwardly a shortdistance from neutral position, so that by moving rod 12 rearwardlylinks 26 will be moved rearwardly to carry the blades beyond the neutralposition and to such position that the anterior surfaces becomeeffective and will act as a brake in slowing down the speed of theplane, and without changing the direction of drive of the propellershaft. 7

Rod 12 passes rearwardly through the drive shaft 10 and near itsrearvend is provided with a threaded portion 28 which engages in theinteriorly threaded hub of a hand wheel 29. The hub of wheel 29 may beswiveled in any suitable stationary frame or bracket 80 through whichthe rear end of shaft 12 extends and by which it is prevented fromturning by a key of said bracket extending into a keyway 31 in said rodAn index finger 32 from said bracket overlays the wheel 29 upon whichare suitably inscribed indices indicating Forward Neutral and Reverse.

By operation of the hand wheel 29 the rod 12 is moved back and forth asdesired.

lVhile I have described what I deem to be the most desirable embodimentof my invention, it is obvious that many of the details may be variedwithout in any way departing from the spirit of my invention, and Itherefore do not limit myself to the exact details of constructionherein set forth nor to anything less than the whole of my inventionlimited only by the appended claims.

combination of a rotatable shaft, propeller.

blades hingedly mounted on said shaft, and a rod slidably mounted insaid shaft and operable to effect movement of said blades on theirhinges.

3. In a. device of the class described, the combination of a rotatabledrive shaft, propeller blades hingedly secured to said shaft, and meansfor moving said blades on their hinges so as to render them selectivelyeffective for driving and for braking, and

to render them ineffective at the will of the operator. 4. In a deviceof the class described, the combination of a rotatable drive shaft,propeller blades hingedly secured to said shaft, a rod slidably mountedin said shaft, and links operable by said rod for effecting movement ofsaid blades on their hinges.

In testimony whereof, I aflix my signature to this specification in thepresence of two subscribing witnesses this 17th day of March, 1921.

' ALBIN DANIELSON. Witnesses:

SARAH SMITH,

MARGARET KoEHL.

